Question

A sample of size n = 50 is drawn from a population
whose standard deviation is o= 26. Find the margin of
error for a 90% confidence interval for u.

If the sample size were n= 40, would the margin of error be larger
or smaller

Answer #1

Refer Z-table or use excel function "=NORM.S.INV((1-0.05))" to find the Z-value.

https://drive.google.com/open?id=1miDykB956rSHGgAYD93YaJKxmD9a_oZ1 |

---------------------------------------------------------------------------------------------

**Therefore as the sample size is decreased, The margin of
error increases.**

1)A sample of size is drawn from a population whose
standard deviation is Find the margin of error for
a confidence interval for μ.
2)A researcher wants to construct a 98% confidence interval for
the proportion of elementary school students in Seward County who
receive free or reduced-price school lunches. What sample size is
needed so that the confidence interval will have a margin of error
of 0.09?
3)An Internet service provider sampled 540 customers and found
that 55 of them experienced an...

A simple random sample of size 11 is drawn from a normal
population whose standard deviation is σ=1.8. The sample mean is
¯x=26.8.
a.) Construct a 85% confidence level for μ. (Round answers to two
decimal place.)
margin of error:
lower limit:
upper limit:
b.) If the population were not normally distributed, what
conditions would need to be met? (Select all that apply.)
the population needs to be uniformly distributed
σ is unknown
simple random sample
large enough sample size...

A simple random sample of size n is drawn from a population that
is normally distributed. The sample mean, x overbarx, is found to
be 112, and the sample standard deviation, s, is found to be 10.
(a) Construct aa 98% confidence interval about muμ if the
sample size, n, is 26.
(b) Construct aa 98% confidence interval about muμ if the
sample size, n, is 12.
(c) Construct aa 90% confidence interval about muμ if the
sample...

A simple random sample of size n is drawn from a population that
is normally distributed. The sample mean, x overbar, is found to
be 108, and the sample standard deviation, s, is found to be
10.
1. A) Construct a 96% confidence interval about μ if
the sample size, n, is 24.
1. B) Construct a 96% confidence interval about μ if
the sample size, n, is 20.
How does increasing the sample size affect the margin
of error,...

1. A sample size of n = 70 is drawn from a population with
proportion p = 0.32. Let p̂ be the sample proportion.
Find p̂m and p̂s . Round the standard deviation to four decimal
places.
Find )28.0p̂P ( > .
Find )40.0p̂P ( <
2. On a certain television channel, 20% of the
commercials are local advertisers. A sample of 150 commercials is
selected. Would it be unusual for more than 26% of the commercials
to be local advertisers?...

A simple random sample of size
n equals n=40
is drawn from a population. The sample mean is found to be
x overbar equals x=121.2
and the sample standard deviation is found to be
s equals s=12.4.
Construct a 99% confidence interval for the population
mean.
Find the lower and upper bounds.

A simple random sample of size n is drawn from a population that
is normally distributed. The samplemean,
x overbar
,
is found to be
105
,
and the sample standarddeviation,s, is found to be
10
.
(a)Construct
an
80
%
confidence interval about
mu
if the samplesize,n, is
26
.
(b)Construct
an
80
%
confidence interval about
mu
if the samplesize,n, is
16
.
(c)Construct
a
70
%
confidence interval about
mu
if the samplesize,n, is
26
.
(d)Could...

A simple random sample of size
n=22
is drawn from a population that is normally distributed. The
sample mean is found to be
x overbar 69
and the sample standard deviation is found to be
s equals=20.
Construct a
90%
confidence interval about the population mean.
The
90%
confidence interval is
(?,?)

a simple random sample of size n is drawn. the sample mea, x, is
found to be 35.1 and the sample standard deviation, s, is found to
be 8.7.
c) construct a 98% confidence interval for u if the sample size,
n, is 40. compare the results to those obtained in part (a). how
does increasing the level of confidence affect the margin of error
E?
d) if the sample size is n=18, what conditions must be satisfied
to compute...

simple random sample of size n is drawn from a population that
is normally distributed. The sample mean, x overbar, is found to
be 112, and the sample standard deviation, s, is found to be
10.
(a) Construct a 90% confidence interval about mu if the
sample size, n, is 19.
(b) Construct a 90% confidence interval about mu if the sample
size, n, is 12.
(c) Construct an 80% confidence interval about mu if the
sample size,...

ADVERTISEMENT

Get Answers For Free

Most questions answered within 1 hours.

ADVERTISEMENT

asked 2 minutes ago

asked 4 minutes ago

asked 6 minutes ago

asked 6 minutes ago

asked 6 minutes ago

asked 9 minutes ago

asked 9 minutes ago

asked 12 minutes ago

asked 12 minutes ago

asked 13 minutes ago

asked 15 minutes ago

asked 15 minutes ago